报告题目：Adaptive Control of Uncertain Nonlinear Systems with Quantized Input Signal
报 告 人：Jing Zhou教授（University of Agder）
报告时间：2018年05月31日9：30
报告地点：南一楼中311室
Abstract：This talk will address the adaptive control of uncertain nonlinear systems in the presence of input quantization. The control signal is quantized by a class of sector-bounded quantizers including the uniform quantizer, the logarithmic quantizer and the hysteresis quantizer. To clearly illustrate the approaches, we will start with a class of single-loop nonlinear systems and then extend the results to multi-loop interconnected nonlinear systems. By using backstepping technique, a new adaptive control algorithm is developed by constructing a new compensation method for the effects of the input quantization. When considering multi-loop interconnected systems with interactions, a totally decentralized adaptive control scheme is developed with a new compensation method incorporated for the unknown nonlinear interactions and quantization error. Unlike some existing control schemes for systems with input quantization, the developed controllers do not require the global Lipschitz condition for the nonlinear functions and also the quantization parameters can be unknown. Besides showing global stability, tracking error performance is also established and can be adjusted by tuning certain design parameters. Simulation results will illustrate the effectiveness of our proposed schemes.
Speaker Biography：Jing Zhou is a Professor at the Department of Engineering Sciences, University of Agder (UiA), Norway. She received her PhD from Nanyang Technological University, Singapore in 2006 and B.ENG in automation from Northwestern Polytechnical University, China in 2000. Before joining UiA, she was a senior research scientist at International Research Institute of Stavanger, Norway, and prior to that he was a postdoc fellow at Norwegian University of Science and Technology, Norway. She made research contributions to adaptive control design of nonlinear systems with non-smooth nonlinearities, including dead-zone, backlash, hysteresis, and saturation. She has extensive industrial experience applying advanced control algorithms to problems including automatic control of drilling systems, kick detection, and well control. Professor Zhou has served on program committees of several international conferences. She is the author of 2 books and over 80 peer-refereed publications. Her research interests include adaptive control, modeling, estimation and control of mechatronic systems, and development of advanced engineering methodologies for oil drilling, marine and mechatronics systems.
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